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// ImGui GLFW binding with OpenGL
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// In this binding, ImTextureID is used to store an OpenGL 'GLuint' texture identifier. Read the FAQ about ImTextureID in imgui.cpp.
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// If your context or own usage of OpenGL involve anything GL3/GL4, prefer using the code in opengl3_example.
// If you are not sure what that means, prefer using the code in opengl3_example.
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// You *might* use this code with a GL3/GL4 context but make sure you disable the programmable pipeline by calling "glUseProgram(0)" before ImGui::Render().
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// We cannot do that from GL2 code because the function doesn't exist. Mixing GL2 calls and GL3/GL4 calls is giving trouble to many librairies/drivers.
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// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this.
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// If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
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// If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp.
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// https://github.com/ocornut/imgui
# include <imgui.h>
# include "imgui_impl_glfw.h"
// GLFW
# include <GLFW/glfw3.h>
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# ifdef _WIN32
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# undef APIENTRY
# define GLFW_EXPOSE_NATIVE_WIN32
# define GLFW_EXPOSE_NATIVE_WGL
# include <GLFW/glfw3native.h>
# endif
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// Data
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static GLFWwindow * g_Window = NULL ;
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static double g_Time = 0.0f ;
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static bool g_MousePressed [ 3 ] = { false , false , false } ;
static float g_MouseWheel = 0.0f ;
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static GLuint g_FontTexture = 0 ;
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// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
// If text or lines are blurry when integrating ImGui in your engine:
// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
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void ImGui_ImplGlfw_RenderDrawLists ( ImDrawData * draw_data )
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{
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// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
ImGuiIO & io = ImGui : : GetIO ( ) ;
int fb_width = ( int ) ( io . DisplaySize . x * io . DisplayFramebufferScale . x ) ;
int fb_height = ( int ) ( io . DisplaySize . y * io . DisplayFramebufferScale . y ) ;
if ( fb_width = = 0 | | fb_height = = 0 )
return ;
draw_data - > ScaleClipRects ( io . DisplayFramebufferScale ) ;
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// We are using the OpenGL fixed pipeline to make the example code simpler to read!
// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers.
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GLint last_texture ; glGetIntegerv ( GL_TEXTURE_BINDING_2D , & last_texture ) ;
GLint last_viewport [ 4 ] ; glGetIntegerv ( GL_VIEWPORT , last_viewport ) ;
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GLint last_scissor_box [ 4 ] ; glGetIntegerv ( GL_SCISSOR_BOX , last_scissor_box ) ;
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glPushAttrib ( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT ) ;
glEnable ( GL_BLEND ) ;
glBlendFunc ( GL_SRC_ALPHA , GL_ONE_MINUS_SRC_ALPHA ) ;
glDisable ( GL_CULL_FACE ) ;
glDisable ( GL_DEPTH_TEST ) ;
glEnable ( GL_SCISSOR_TEST ) ;
glEnableClientState ( GL_VERTEX_ARRAY ) ;
glEnableClientState ( GL_TEXTURE_COORD_ARRAY ) ;
glEnableClientState ( GL_COLOR_ARRAY ) ;
glEnable ( GL_TEXTURE_2D ) ;
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//glUseProgram(0); // You may want this if using this code in an OpenGL 3+ context
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// Setup viewport, orthographic projection matrix
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glViewport ( 0 , 0 , ( GLsizei ) fb_width , ( GLsizei ) fb_height ) ;
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glMatrixMode ( GL_PROJECTION ) ;
glPushMatrix ( ) ;
glLoadIdentity ( ) ;
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glOrtho ( 0.0f , io . DisplaySize . x , io . DisplaySize . y , 0.0f , - 1.0f , + 1.0f ) ;
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glMatrixMode ( GL_MODELVIEW ) ;
glPushMatrix ( ) ;
glLoadIdentity ( ) ;
// Render command lists
# define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT))
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for ( int n = 0 ; n < draw_data - > CmdListsCount ; n + + )
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{
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const ImDrawList * cmd_list = draw_data - > CmdLists [ n ] ;
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const ImDrawVert * vtx_buffer = cmd_list - > VtxBuffer . Data ;
const ImDrawIdx * idx_buffer = cmd_list - > IdxBuffer . Data ;
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glVertexPointer ( 2 , GL_FLOAT , sizeof ( ImDrawVert ) , ( const GLvoid * ) ( ( const char * ) vtx_buffer + OFFSETOF ( ImDrawVert , pos ) ) ) ;
glTexCoordPointer ( 2 , GL_FLOAT , sizeof ( ImDrawVert ) , ( const GLvoid * ) ( ( const char * ) vtx_buffer + OFFSETOF ( ImDrawVert , uv ) ) ) ;
glColorPointer ( 4 , GL_UNSIGNED_BYTE , sizeof ( ImDrawVert ) , ( const GLvoid * ) ( ( const char * ) vtx_buffer + OFFSETOF ( ImDrawVert , col ) ) ) ;
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for ( int cmd_i = 0 ; cmd_i < cmd_list - > CmdBuffer . Size ; cmd_i + + )
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{
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const ImDrawCmd * pcmd = & cmd_list - > CmdBuffer [ cmd_i ] ;
if ( pcmd - > UserCallback )
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{
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pcmd - > UserCallback ( cmd_list , pcmd ) ;
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}
else
{
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glBindTexture ( GL_TEXTURE_2D , ( GLuint ) ( intptr_t ) pcmd - > TextureId ) ;
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glScissor ( ( int ) pcmd - > ClipRect . x , ( int ) ( fb_height - pcmd - > ClipRect . w ) , ( int ) ( pcmd - > ClipRect . z - pcmd - > ClipRect . x ) , ( int ) ( pcmd - > ClipRect . w - pcmd - > ClipRect . y ) ) ;
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glDrawElements ( GL_TRIANGLES , ( GLsizei ) pcmd - > ElemCount , sizeof ( ImDrawIdx ) = = 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT , idx_buffer ) ;
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}
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idx_buffer + = pcmd - > ElemCount ;
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}
}
# undef OFFSETOF
// Restore modified state
glDisableClientState ( GL_COLOR_ARRAY ) ;
glDisableClientState ( GL_TEXTURE_COORD_ARRAY ) ;
glDisableClientState ( GL_VERTEX_ARRAY ) ;
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glBindTexture ( GL_TEXTURE_2D , ( GLuint ) last_texture ) ;
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glMatrixMode ( GL_MODELVIEW ) ;
glPopMatrix ( ) ;
glMatrixMode ( GL_PROJECTION ) ;
glPopMatrix ( ) ;
glPopAttrib ( ) ;
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glViewport ( last_viewport [ 0 ] , last_viewport [ 1 ] , ( GLsizei ) last_viewport [ 2 ] , ( GLsizei ) last_viewport [ 3 ] ) ;
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glScissor ( last_scissor_box [ 0 ] , last_scissor_box [ 1 ] , ( GLsizei ) last_scissor_box [ 2 ] , ( GLsizei ) last_scissor_box [ 3 ] ) ;
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}
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static const char * ImGui_ImplGlfw_GetClipboardText ( void * user_data )
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{
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return glfwGetClipboardString ( ( GLFWwindow * ) user_data ) ;
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}
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static void ImGui_ImplGlfw_SetClipboardText ( void * user_data , const char * text )
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{
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glfwSetClipboardString ( ( GLFWwindow * ) user_data , text ) ;
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}
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void ImGui_ImplGlfw_MouseButtonCallback ( GLFWwindow * , int button , int action , int /*mods*/ )
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{
if ( action = = GLFW_PRESS & & button > = 0 & & button < 3 )
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g_MousePressed [ button ] = true ;
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}
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void ImGui_ImplGlfw_ScrollCallback ( GLFWwindow * , double /*xoffset*/ , double yoffset )
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{
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g_MouseWheel + = ( float ) yoffset ; // Use fractional mouse wheel, 1.0 unit 5 lines.
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}
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void ImGui_ImplGlFw_KeyCallback ( GLFWwindow * , int key , int , int action , int mods )
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{
ImGuiIO & io = ImGui : : GetIO ( ) ;
if ( action = = GLFW_PRESS )
io . KeysDown [ key ] = true ;
if ( action = = GLFW_RELEASE )
io . KeysDown [ key ] = false ;
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( void ) mods ; // Modifiers are not reliable across systems
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io . KeyCtrl = io . KeysDown [ GLFW_KEY_LEFT_CONTROL ] | | io . KeysDown [ GLFW_KEY_RIGHT_CONTROL ] ;
io . KeyShift = io . KeysDown [ GLFW_KEY_LEFT_SHIFT ] | | io . KeysDown [ GLFW_KEY_RIGHT_SHIFT ] ;
io . KeyAlt = io . KeysDown [ GLFW_KEY_LEFT_ALT ] | | io . KeysDown [ GLFW_KEY_RIGHT_ALT ] ;
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io . KeySuper = io . KeysDown [ GLFW_KEY_LEFT_SUPER ] | | io . KeysDown [ GLFW_KEY_RIGHT_SUPER ] ;
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}
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void ImGui_ImplGlfw_CharCallback ( GLFWwindow * , unsigned int c )
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{
ImGuiIO & io = ImGui : : GetIO ( ) ;
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if ( c > 0 & & c < 0x10000 )
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io . AddInputCharacter ( ( unsigned short ) c ) ;
}
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bool ImGui_ImplGlfw_CreateDeviceObjects ( )
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{
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// Build texture atlas
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ImGuiIO & io = ImGui : : GetIO ( ) ;
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unsigned char * pixels ;
int width , height ;
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io . Fonts - > GetTexDataAsRGBA32 ( & pixels , & width , & height ) ; // Load as RGBA 32-bits (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
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// Upload texture to graphics system
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GLint last_texture ;
glGetIntegerv ( GL_TEXTURE_BINDING_2D , & last_texture ) ;
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glGenTextures ( 1 , & g_FontTexture ) ;
glBindTexture ( GL_TEXTURE_2D , g_FontTexture ) ;
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glTexParameteri ( GL_TEXTURE_2D , GL_TEXTURE_MIN_FILTER , GL_LINEAR ) ;
glTexParameteri ( GL_TEXTURE_2D , GL_TEXTURE_MAG_FILTER , GL_LINEAR ) ;
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glTexImage2D ( GL_TEXTURE_2D , 0 , GL_RGBA , width , height , 0 , GL_RGBA , GL_UNSIGNED_BYTE , pixels ) ;
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// Store our identifier
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io . Fonts - > TexID = ( void * ) ( intptr_t ) g_FontTexture ;
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// Restore state
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glBindTexture ( GL_TEXTURE_2D , last_texture ) ;
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return true ;
}
void ImGui_ImplGlfw_InvalidateDeviceObjects ( )
{
if ( g_FontTexture )
{
glDeleteTextures ( 1 , & g_FontTexture ) ;
ImGui : : GetIO ( ) . Fonts - > TexID = 0 ;
g_FontTexture = 0 ;
}
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}
bool ImGui_ImplGlfw_Init ( GLFWwindow * window , bool install_callbacks )
{
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g_Window = window ;
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ImGuiIO & io = ImGui : : GetIO ( ) ;
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io . KeyMap [ ImGuiKey_Tab ] = GLFW_KEY_TAB ; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
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io . KeyMap [ ImGuiKey_LeftArrow ] = GLFW_KEY_LEFT ;
io . KeyMap [ ImGuiKey_RightArrow ] = GLFW_KEY_RIGHT ;
io . KeyMap [ ImGuiKey_UpArrow ] = GLFW_KEY_UP ;
io . KeyMap [ ImGuiKey_DownArrow ] = GLFW_KEY_DOWN ;
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io . KeyMap [ ImGuiKey_PageUp ] = GLFW_KEY_PAGE_UP ;
io . KeyMap [ ImGuiKey_PageDown ] = GLFW_KEY_PAGE_DOWN ;
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io . KeyMap [ ImGuiKey_Home ] = GLFW_KEY_HOME ;
io . KeyMap [ ImGuiKey_End ] = GLFW_KEY_END ;
io . KeyMap [ ImGuiKey_Delete ] = GLFW_KEY_DELETE ;
io . KeyMap [ ImGuiKey_Backspace ] = GLFW_KEY_BACKSPACE ;
io . KeyMap [ ImGuiKey_Enter ] = GLFW_KEY_ENTER ;
io . KeyMap [ ImGuiKey_Escape ] = GLFW_KEY_ESCAPE ;
io . KeyMap [ ImGuiKey_A ] = GLFW_KEY_A ;
io . KeyMap [ ImGuiKey_C ] = GLFW_KEY_C ;
io . KeyMap [ ImGuiKey_V ] = GLFW_KEY_V ;
io . KeyMap [ ImGuiKey_X ] = GLFW_KEY_X ;
io . KeyMap [ ImGuiKey_Y ] = GLFW_KEY_Y ;
io . KeyMap [ ImGuiKey_Z ] = GLFW_KEY_Z ;
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io . RenderDrawListsFn = ImGui_ImplGlfw_RenderDrawLists ; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
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io . SetClipboardTextFn = ImGui_ImplGlfw_SetClipboardText ;
io . GetClipboardTextFn = ImGui_ImplGlfw_GetClipboardText ;
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io . ClipboardUserData = g_Window ;
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# ifdef _WIN32
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io . ImeWindowHandle = glfwGetWin32Window ( g_Window ) ;
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# endif
if ( install_callbacks )
{
glfwSetMouseButtonCallback ( window , ImGui_ImplGlfw_MouseButtonCallback ) ;
glfwSetScrollCallback ( window , ImGui_ImplGlfw_ScrollCallback ) ;
glfwSetKeyCallback ( window , ImGui_ImplGlFw_KeyCallback ) ;
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glfwSetCharCallback ( window , ImGui_ImplGlfw_CharCallback ) ;
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}
return true ;
}
void ImGui_ImplGlfw_Shutdown ( )
{
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ImGui_ImplGlfw_InvalidateDeviceObjects ( ) ;
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ImGui : : Shutdown ( ) ;
}
void ImGui_ImplGlfw_NewFrame ( )
{
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if ( ! g_FontTexture )
ImGui_ImplGlfw_CreateDeviceObjects ( ) ;
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ImGuiIO & io = ImGui : : GetIO ( ) ;
// Setup display size (every frame to accommodate for window resizing)
int w , h ;
int display_w , display_h ;
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glfwGetWindowSize ( g_Window , & w , & h ) ;
glfwGetFramebufferSize ( g_Window , & display_w , & display_h ) ;
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io . DisplaySize = ImVec2 ( ( float ) w , ( float ) h ) ;
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io . DisplayFramebufferScale = ImVec2 ( w > 0 ? ( ( float ) display_w / w ) : 0 , h > 0 ? ( ( float ) display_h / h ) : 0 ) ;
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// Setup time step
double current_time = glfwGetTime ( ) ;
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io . DeltaTime = g_Time > 0.0 ? ( float ) ( current_time - g_Time ) : ( float ) ( 1.0f / 60.0f ) ;
g_Time = current_time ;
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// Setup inputs
// (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
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if ( glfwGetWindowAttrib ( g_Window , GLFW_FOCUSED ) )
{
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double mouse_x , mouse_y ;
glfwGetCursorPos ( g_Window , & mouse_x , & mouse_y ) ;
io . MousePos = ImVec2 ( ( float ) mouse_x , ( float ) mouse_y ) ; // Mouse position in screen coordinates (set to -1,-1 if no mouse / on another screen, etc.)
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}
else
{
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io . MousePos = ImVec2 ( - 1 , - 1 ) ;
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}
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for ( int i = 0 ; i < 3 ; i + + )
{
io . MouseDown [ i ] = g_MousePressed [ i ] | | glfwGetMouseButton ( g_Window , i ) ! = 0 ; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
g_MousePressed [ i ] = false ;
}
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io . MouseWheel = g_MouseWheel ;
g_MouseWheel = 0.0f ;
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// Hide OS mouse cursor if ImGui is drawing it
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glfwSetInputMode ( g_Window , GLFW_CURSOR , io . MouseDrawCursor ? GLFW_CURSOR_HIDDEN : GLFW_CURSOR_NORMAL ) ;
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// Start the frame
ImGui : : NewFrame ( ) ;
}